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THOMAS F; FIELD, OF SUGERTIES, NEIN/'.YORK.V`

Leners Para: ivo. 61,412, dated January 22, 1867.

nmovno nevica-ron CHANGING WATER 1N STEAM strenuous.

TO ALL WHOM IT MAY CONCER:

Be it known that I,- TH0MAS F. FIE'LD, of Saugerties, in the county ofUlster, andState of New York, have invented an Improved Device forChanging the Water in Steam Boilers while still under pressure of steam;and I do'hcreby declare that the following is a full and exactdescription thereof, reference being had to the accompanying drawings,making 'part of this specification--k Figure 1 being a central verticalsection of, the device, as attached to the headfof a steam boiler.

Figure 2, a view of the inner end thereof.

Figure 8, a side view ofthe same with its cap on, as when not in use.

Like letters designate corresponding parts in all of the tigures.

The device consists of a short pipe or nozzle, A, which is provided-witha lancb, a, by nhicbvit is secured to the head B of a steaznboiler,above the water-line thereof, by means-ot' bolts b b and nuts e a. Theouter end is provided with a screw-thread, g, wherebythe end of a. hoseis attached when water is to be let into the boiler, or on which a cap',C, (tig. is screwed to secure'all when the engi-ne is at work. Thus far,the invention, does not di`er fromthe ordinary construction. Myinvention consists in a valve, D, hinged to the inner end of the pipeA,vso as to close the same outwardly, and to open of itself, underpressure, inwardly. The hinge d of the valve is at the top, so that thevalve can close by its own weight,'and the valve-seams preferably alittle inclined, as shown, so that the valve will close down more rmly'by its own weight. The llolef, in the boiler head, is made large enoughto allow the valve to play.

The use and advantages of this valve applied to the fixedn nozzle orpipe are these:. Ordinarily, when it is required to change the water inthe boilers, (especially marine boilers,) toprevent incrustation bysaltor the deposit of sediment from foul Water, the fires must be put out,and the* engine lie idle till the water cools down and the pressure ofsteam ceases, which usually requires from one-halfto three-fourths of anhour delay; and

if the steam has'not wholly subsided, when the hose is attached it.blowsinto the hose and scalds the leather, and thus destroys it-a frequentaccident; and sometimes the sudden pressure of the steam let in burststhe hose'. My invention obviates all 'of these objections; for when thehose is attached to the nozzle A, no steam can come out till the valve Dopens, and this. valve cannotopen till the pressure oiwater in 'the hose(generally Y supplied under pressure from hydrants orvt'orce-pumps)overcomes .the pressure of the steam inside and flows into the boilerand condensesthe steam. VIf the pressure of' water in the hose isgreater than that of the steam in the boiler, then the water can bechanged immediately onvputting on theA hose;'but if it is not suicient,the tire has only to be slackened somewhat till the pressure of thewater becomes sufcient. By the use of this valve, also, there isnodiiculty nor danger in attaching the hose to the noz'zle on Vac cuntof' the steam blowing out,

Another advantage sometimes incident to the boilers of ste'amboats is,that thevalve D (if the cap C is habitually left olf, it not beingA 'anecessary part ot' the device) will prevent the collapse of the boiler,in case of the sudden sinking oir the boat and condensation of the steamin the boiler. Such accidents are not uncommon with the old plan of feednozzle, when gunboats -or other waryessels are `suddenly sunk by theenemys tire. But they could not happen with any invention applied to theboiler.

What I claim as my invention, and desire to secure byv Letters Patent,is- The valve D applied to and in combination with thea change-waterfeed nozzle -of steam boilers, and operating in connection with a feedpipe or hose under pressure, substantially as and for the pifposesherein set forth.' The above specication of my Vimproved device-forchanging the water in steam boilers signed by me this 26th day of April,1866. 4 I A THOS. FI FIELD.

Witnesses:

J. S. BROWN, JOHN H. FIELD.

